<!--
 * @Description: 其他
 * @Author: zzj
 * @Date: 2021-08-16 20:51:52
 * @LastEditors: zzj
 * @LastEditTime: 2021-08-16 21:19:45
-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>其他</title>
    <style>
        .one{
            cursor: help;
        }
        .two,.three{
            width: 100px;
            height: 100px;
            margin-top: 10px;
        }
        .two{
            background-color: aqua;
            visibility: hidden;
        }
        .three{
            background-color:black;
            opacity: .2;
        }
        .four{
            background-color: blueviolet;
            color: black;
        }
        .four > span{
            display: inline-block;
        }
        .four > span:nth-child(1){
            height: 100px;
            background-color: blanchedalmond;
        }
    </style>
</head>
<body>
    <div class="one">hello world</div>
    <div class="two"></div>
    <div class="three"></div>

    <div class="four">
        <span>one</span>
        <span>two</span>
        <span>three</span>
    </div>
</body>
</html>